Comprehensive underground test method for deformation and damage of terranes of mining top plate and mining bottom plate of coal bed

Abstract

The invention discloses a comprehensive underground test method for deformation and damage of terranes of mining top plate and mining bottom plate of a coal bed, comprising the following steps of: (1) constructing a comprehensive test system; (2) utilizing a network parallel electrical method to synchronously collect test electrode supply current and potential signal in boreholes of the top plate and the bottom plate, thus obtaining the electric field distribution situation between the top plate and the bottom plate of the working face in a control area; (3) respectively extracting the electric field parameter distribution situation of rock masses, the seismic velocity distribution situation and the displacement variation of terranes at different places in the borehole in the control area according to the collected data characteristics of various geophysical fields; (4) dynamically obtaining the parameter change of the geophysical fields in a detected area at different time along with the advancing state of the working face; and (5) completing the installation and sealing of facilities in the tested borehole before the stoping of the coal face. The method precisely masters the damage situation of the rock masses, thus not only delimitating the deformation and damage distribution situation of rock masses in the control area, but also precisely determining the water-guiding fissure zone height of the covered rock masses of the top plate and the damage depth value of the bottom plate.

Description

Technical field: [0001] The invention relates to a mine geophysical prospecting technology, which uses the geophysical field monitoring technology in the roof and floor rock mass of the working face to establish a comprehensive test system for the deformation and failure of the roof and floor rocks in coal seam mining, solves the problem of roof deformation and damage, and obtains "two Belt" height and floor damage depth values. Background technique: [0002] The deformation and failure of the roof and floor strata in the stope of the mine working face have a serious impact on the safe and efficient production of the mine. The height of the water-conducting fissure zone formed by the failure of the rock mass is an important technical parameter for the prevention and control of mine water hazards. The technical parameters such as the development height of the roof cracks and the damage depth of the floor have important practical significance for guiding the rational layout of...

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Problems solved by technology

[0004] The invention solves the problem of testing the deformation and destruction of the top and bottom slabs of the working face within a certain control area during the mining process of the working face.

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